Two-shaft opposed-piston internal-combustion engine



Oct. 3, 1944. w. KILCHENMANN Filed July 7, 1942 TWO-SHAFT OPPOSED-PISTON INTERNAL-COMBUSTION ENGINE II l I I 1 l A l I l l l II III I:

. 'directions to each other of the cylinders.

Patented Oct. 3. 1944.

2,359,564 'rwo-snm-orrosnn-rrsroiv COMBUSTION ENGINE Walter Kilchenmann, Winterthur; Switaerland, assignor to Sulzer Frres, Soclt Anonyme, Winterthnr, Switzerland 4 Application July 7, 1942, Serial No. 449,993

The invention relates to a two-shaft opposed- -piston internal combustion engine in which a reciprocating pump is provided foreach cylinder for delivering and compressing the combustion air. The invention is characterised by the cylinders of the reciprocating pumps being staggered in order to reduce the length of the engine.

Preferably the axes of the cylinders of the reciprocating pumps are inclined to each other in a V. The pistons of the pumps can for instance be linked to the connecting rods oi? the respective power cylinder pistons in such a way that the normal pressure exerted by the connecting rods on the power pistons is diminished. In opposedpiston internal combustion engines which work on the two-stroke cycle, it is preferable to link the pistons of the pumps the power pistons controlling the. outlet ports.

Two examples of execution according to the invention are represented in a simplified manner in the drawing.

to a driving element of Figs. 1 and 2 show one example of execution in-' cross-section and in plan respectively and Fig. 3 the cross-section through the second example of execution.

The power pistons I and 2 move in opposite and drive through the connecting rods 3 and 4, through the crankshafts 5 and 6 and through thepinions I and 8 a central gearwheel 9 keyed on the main shaft ID. The combustion air flows from the pipe ll into the scavenging duct [2, from which it passes through the ports The products of combustion pass from the combustion space through the ports i4 and the duct i5 into the exhaust gas manifold 16. a

For providing the scavenging air a reciprocating pump I1 delivering'air into the pipe II is provided for each power cylinder. In order to be able to shorten the length L of the engine, the cylinders of the reciprocating pumps H are arranged staggered with respect to each other.

In the example of execution according. to Figs. 1 and 2 the cylinders of the reciprocating pumps are parallel to each other, but are staggered with respect to a straight line, so-that the distances between their axes measured in the direction of the length of the engine is less than the total of the overall cylinder diameters. It is thereby possible to arrange the power cylinders so close to each other that the.length L of the engine is reduced to a minimum. The connecting rods 13 into the'combustion space Switzerland November 8, 1941 3 Claims. (Cl. 123-51)- connecting rods 4 of the .power. pistons 2 which control the exhaust ports.

The reciprocating pumps cording to Fig. 3 are arranged obliquely to each other in the form of av andcan in this way be staggered with respect to each other, Through the connecting rods l8 the pump pistons, l-9 are linked to the connecting rodsl of the pistons 2 controllingthe exhaust ports- H, in such a way that the normal pressure exerted by the connecting rods. 4 on the power pistons is The crankshaft 6 turns in the direction of the arrow 20. -A normal pressure downwards is therefore exerted by the connecting rod 4 on the piston 2 during the combustion stroke. At

the same time thepump piston lil also presses on the joint 2| 0n the connecting rod 4 through the connecting rod l8. The normal pressure ex-' erted on the power pistonis thusdiminished,

since the 'crankpin bearlng lies between the piston 2 and the joint 2! to rod I8 is attached.

I claim: v

1. An opposed-piston internal combustion engine having two crankshafts and a plurality of cylinders for the pistons connected to the crankshafts, a reciprocating pump for each cylinder for delivering compressed combustion air to the cylinder, each pump being located in a lateral position with respect to the cylinderof each of opposed pistons, each pump cylinder being staggered and inclined with respect to the adja cent pump cylinders and each pump-piston having its connecting rod connected to the connecting rod of an engine-piston,

2. A two-shaft opposed-piston internal combustion engine having two crankshafts and a plurality of cylinders for the pistons connected to the crankshafts, a reciprocating pump for each cylinder for delivering compressed combustion air to the cylinder,' each pump being located in a lateral position with respect to the cylinder of each pair of opposed pistons, each pump cylinder being' staggered with respect to the adjacent pump cylinders and each pump-piston having its I connecting rod connected to the connecting rod of-an engine-piston, the point of connection of the pump-piston connecting rod' to the engine- 1 piston connecting rod being spaced to one side of 18 0f the pistons I9 are linked by a joint 4' to the ll of the e e acwhich the connectin internal" combustion engine having two ciankshafts and a plurality of cylinders for the pistons connected to the crankshafts, a reciprocating pump for each cylinder for delivering compressed combustion air to the cylinder, each pump being located 'in a. lateral position with respect to the cylinder of each pair of opposed pistons, each pump cylinder being staggered with respect to the adjacent pump cylinders and each pump-piston having its connecting rod connected to the connecting rod of an engine-piston, the pump-piston connect- 10 ing rod being connected to'the engine-piston connecting rod at'a. point to one side of the point where the engine-piston connecting rod connects to the crank-shaft, saidpoint to one side of the connection with the crank-shaft being so located that the crank-shaft serves as a fulcrum, whereby the pressure of the pump-piston rod tends to raise the engine-piston.

- WALTER KILCHENMANN.

CERTIFICATE. OF CORRECTION. Patent No. 2,559,56h October 5, 191m.

WALTER KILCHENMANN.

It is hereby certified that error appears in the printed specification of the above numbered patent requiring correction as follows: Page 1, sec- 0nd column line 56, claim 2, and line 51;, claim}, for "A two-shaft read -An--; and that the said Letters Patent shouldbe-read with this .correction therein that the same may conform to Etherecord of the case in the Patent Office. 7

Signed and sealed this 5th day of December, A. D. 19%.-

Leslie Frazer (Seal) Acting Commissioner of Patents. 

